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.r6) Sequoia 680 Chesapcake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1900 Bates Avenue Suite L Concord,CA 94520 (510) 686 9600 rAX (510)686 9689 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Gettler Ryar/Geostrategles Client ProjedID Unocal#6189 <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Greg Gurst Work Order# 9410-391 -01 Reported Oct 10, 1994 } <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> QC Batch#. GC100794BTEX17A GC100794BTEX17A GC100794BTEX17A GC100794BTEX17A <br /> Analy. Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Prep. Method N A N A. N A N A <br /> Analyst J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD # 941OH95-02B 941OH95-02B 941OH95.02B 941OH95-02B <br /> Sample Conc N D N D N D N D <br /> Prepared Date N A N A N A N A <br /> Analyzed Date 10/7/94 10/7/94 10/7/94 10/7/94 <br /> Instrument 1.13 # GCHP17 GCHP17 GCHP17 GCHP17 <br /> Conc. Sp:ked 10vg/L 10ug/L 10ug/L 30)Jg/L <br /> Result 93 95 97 30 <br /> MS % Recovery 93 95 97 100 <br /> Dup. Result 97 99 10 30 <br /> MSD % Recov 97 99 100 100 <br /> RPD 42 41 30 00 <br /> RPD Limit 0-50 0-50 0-50 0-50 <br /> ] • JL i J <br /> r 1 r J r r• �J <br /> LCS # <br /> Prepared Date <br /> Analyzed Date <br /> Instrument I D #: <br /> Conc Spiked: <br /> LCS Result. <br /> LCS % Recov: <br /> LCS <br /> Control Limits 71-133 72-128 72-130 71-120 <br /> Please Note <br /> The LCS is a control sample of known,interferent-free matrix that is analyzed using the same ricagenls, <br /> SEQUOIA-ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> To ive <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9410-391 GET <i> <br />